This long (more than an inch) black beetle was all but invisible on the stony path I was walking on in Tatton Park. I had no great hopes for the photograph, but the image comes up reasonably well with a bit of brightening up.
I think this is a Devil’s Coach Horse Beetle. Apparently, this is one of 46000 species of the rove beetle family, a fast and ferocious night time predator. And it has a nasty bite and can emit a foul smelling odour. I had sort of intuited that it was an unsavoury character!
The segmented abdomen allows it to curl the tail up, like a scorpion. Neither the Wildlife Trusts (above link) nor Wikipedia explains why – I’d guess it’s for balance.